Fix for high charts bug with stacked areas.
Fix for high charts bug with stacked areas.

stefanseifert/redash,M32Media/redash,guaguadev/redash,easytaxibr/redash,jmvasquez/redashtest,imsally/redash,akariv/redash,useabode/redash,vishesh92/redash,guaguadev/redash,alexanderlz/redash,imsally/redash,guaguadev/redash,M32Media/redash,pubnative/redash,jmvasquez/redashtest,alexanderlz/redash,pubnative/redash,rockwotj/redash,akariv/redash,hudl/redash,alexanderlz/redash,denisov-vlad/redash,rockwotj/redash,stefanseifert/redash,moritz9/redash,crowdworks/redash,vishesh92/redash,M32Media/redash,guaguadev/redash,moritz9/redash,easytaxibr/redash,denisov-vlad/redash,stefanseifert/redash,jmvasquez/redashtest,ninneko/redash,alexanderlz/redash,denisov-vlad/redash,chriszs/redash,akariv/redash,amino-data/redash,vishesh92/redash,pubnative/redash,hudl/redash,jmvasquez/redashtest,crowdworks/redash,EverlyWell/redash,denisov-vlad/redash,M32Media/redash,44px/redash,easytaxibr/redash,moritz9/redash,easytaxibr/redash,amino-data/redash,amino-data/redash,stefanseifert/redash,denisov-vlad/redash,rockwotj/redash,easytaxibr/redash,getredash/redash,chriszs/redash,amino-data/redash,imsally/redash,akariv/redash,hudl/redash,ninneko/redash,useabode/redash,EverlyWell/redash,pubnative/redash,crowdworks/redash,useabode/redash,imsally/redash,hudl/redash,44px/redash,vishesh92/redash,ninneko/redash,akariv/redash,EverlyWell/redash,getredash/redash,EverlyWell/redash,ninneko/redash,moritz9/redash,getredash/redash,44px/redash,ninneko/redash,getredash/redash,pubnative/redash,guaguadev/redash,rockwotj/redash,chriszs/redash,useabode/redash,crowdworks/redash,44px/redash,getredash/redash,jmvasquez/redashtest,chriszs/redash,stefanseifert/redash